strconv: make code formatting more consistent in doc.go
strconv: make code formatting more consistent in doc.go

Replaces " \t" code indentation with "\t".

Issues like this are easy to spot with editor that prints
whitespace charecters.

Change-Id: Ia82877e7c99121bf369fa76e46ba52dff84f36bf
Reviewed-on: https://go-review.googlesource.com/101355
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

josharian/go,CAFxX/go,Cofyc/go,cloudflare/go,CAFxX/go,codestation/go,josharian/go,nawawi/go,golang/go,Cofyc/go,Cofyc/go,nawawi/go,Cofyc/go,CAFxX/go,akutz/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,akutz/go,nawawi/go,codestation/go,josharian/go,josharian/go,codestation/go,nawawi/go,Cofyc/go,josharian/go,josharian/go,cloudflare/go,cloudflare/go,CAFxX/go,akutz/go,nawawi/go,josharian/go,CAFxX/go,codestation/go,akutz/go,golang/go,golang/go,akutz/go,codestation/go,Cofyc/go,codestation/go,josharian/go,Cofyc/go,akutz/go,akutz/go,golang/go,cloudflare/go,codestation/go,nawawi/go,cloudflare/go,cloudflare/go,Cofyc/go,akutz/go,golang/go,cloudflare/go,golang/go,golang/go,CAFxX/go,CAFxX/go,codestation/go,nawawi/go